J. R. Armenteros · RF / Microwave

Amsterdam · Miami — EU & U.S. work authorized

Juan Ricardo
Armenteros .

RF & Microwave Engineer — Ph.D. Researcher, Florida International University

I design, simulate and measure RF hardware — power amplifiers, LNAs and antennas — and I build the numerical solvers behind the simulation tools.

Focus  PA · LNA · Antennas · EM Simulation Tools  ADS · HFSS · Maxwell · MATLAB Degrees  M.S. 2023 · Ph.D. in progress

About

Profile

Electrical engineer whose career runs from maritime service engineering in the Netherlands to graduate RF / microwave research at FIU in Miami.

I work across the full chain: circuit and electromagnetic design in ADS and HFSS, fabrication, and VNA measurement — including root-causing what the measurements reveal. Alongside the hardware, I write numerical electromagnetic solvers from scratch (FDTD in MATLAB), so I understand the tools at the level of the equations, not just the interface.

Current Ph.D. research focuses on RF / microwave sensing of lossy media. Earlier hands-on work includes component-level repair of marine radar and VHF/UHF communications, wafer-level fabrication coursework, and teaching analog electronics and EM fields labs.

Selected Projects

Design · Simulation · Measurement

GaN HEMT Power Amplifier, 2–6 GHz

01

Designed in Keysight ADS with HFSS EM simulation, fabricated on RO4003C and validated on a vector network analyzer. Measured oscillation was root-caused and documented — not hidden.

Band 2–6 GHzSubstrate RO4003CFinding S11 > 0 dB @ 1.36 GHz
Keysight ADS · HFSS · VNA

Low-Noise Amplifier

02

ATF-54143 LNA design with full stability analysis — a low-noise front-end balanced for gain, noise and stability.

Noise figure 0.57 dBGain 14.9 dBDevice ATF-54143
LNA Design · Stability Analysis

Patch Antenna & Array

03

Single element and array modelled in ANSYS HFSS. Inset-feed parametric optimization substantially improved match and efficiency at 2.4 GHz.

Element −11.5 dB @ 2.38 GHzArray ≈ −16 dBOptimized −25 dB @ 2.4 GHzEfficiency ~95%
ANSYS HFSS · Antenna Design

FDTD Solvers from Scratch

04

1D / 2D finite-difference time-domain electromagnetic solvers in MATLAB: absorbing boundaries, lossy and dispersive media, Drude plasma model and running DFT — validated against analytical solutions with grid-convergence studies.

1D & 2D FDTDDrude plasmaValidated vs. analytical
MATLAB · FDTD · Computational EM

EM Device Models

05

ANSYS Maxwell models of magnetics: coil inductance with ferrite core and a double-winding transformer transient model with eddy currents and ohmic-loss analysis.

Coil 572 nH → 1.97 µHEnhancement ×3.44
ANSYS Maxwell · Magnetics

Reflectarray Unit Cell

06

Periodic unit-cell analysis of a rectangular patch reflectarray element in TICRA Tools — layered-media MoM with ground plane across a wide sweep.

Sweep 8–14 GHzCell 15 × 15 mm
TICRA Tools · MoM · Reflectarray

Radar Data Analysis

07

Analysis of NASA HIWRAP airborne radar data in MATLAB — working directly with scan and range-gate structure from a real airborne instrument.

Frequency 13.89 GHzData 51 scans × 27 gates
MATLAB · NASA HIWRAP · Radar

Mobile Robotics — Course Paper

08

“Differential-Drive Mobile Robot with Wheel-Induced Camera Occlusion” — a ROS 2 / Gazebo SLAM study. Course paper submitted for review during graduate coursework.

ROS 2Gazebo SLAMCourse paper
ROS 2 · SLAM · Robotic Vision

Experience

2021 — Present · Research & Engineering
Jan 2021 — Present

Graduate Research Assistant, RF / Microwave Research

Florida International University — Miami, FL

RF / microwave design, EM simulation and measurement: amplifiers, LNAs, antennas and computational EM (FDTD). Ph.D. research on RF / microwave sensing of lossy media.

2022 — 2023

Graduate Teaching Assistant

University of Central Florida

Analog electronics labs and electromagnetic fields — lab instruction and student support.

2014 — 2021

Freelance Electronics & IT Technician

Independent

Electronics and IT troubleshooting, repair and support for clients.

2010 — 2012

Service Engineer

Alphatron Marine — Netherlands

JRC radar and VHF / UHF communications on commercial and military vessels, including component-level repair.

2007 — 2009

Service Engineer

Koike Europe B.V. — Netherlands

Service engineering in the Netherlands — installation, maintenance and repair work.

Education

FIU · Hogeschool Utrecht
In progress

Ph.D., Electrical & Computer Engineering

Florida International University — Graduate GPA 3.67. Research: RF / microwave sensing of lossy media.

2023

M.S., Electrical Engineering

Florida International University

2020

B.S., Electrical Engineering

Florida International University

2009 — 2011

Studies — Hogeschool Utrecht

University of Applied Sciences Utrecht, Netherlands — digital / analog systems, electronics, mathematics and transmission engineering.

Skills & Tools

What I work with daily

Simulation & Design Tools

Keysight ADSANSYS HFSSANSYS MaxwellAWR Microwave OfficeTICRA Tools

Programming & Methods

MATLABPythonFDTDMoMFEM

RF Design & Measurement

Amplifier designLNA designAntenna designVNA measurementS-parameter characterization

Fabrication Coursework

Wafer-level fabricationMEMS pressure sensorFDSOI — course final projectCleanroom characterization

Languages

Communication
SpanishNative
EnglishFluent
DutchFluent
ItalianBasic

Open to RF engineering roles in the Netherlands & the U.S.

Junior / mid-level RF, microwave and antenna engineering — design, simulation, lab measurement and test. Based between Amsterdam and Miami, authorized to work in both the EU and the U.S. The fastest way to reach me is email or LinkedIn.

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